Using Environmental Isotopes2H and18O for Identification of Infiltration Processes in Floodplain Ecosystems of the River Elbe

Besides the beneficial use of dredged material, sustainable relocation, which means keeping the sediments in the natural aquatic material circulation, is one goal for handling dredged material in the port of Hamburg. Decreasing contamination the River Elbe and new dredged material guidelines provide a basis for this. With comprehensive investigations, near- and far-field transport and the effects of relocation regarding the water quality and the benthic community were determined thus deveoloping conditions for future operating strategies.

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Sources and transport of phosphorus in the Vltava river basin (Czech Republic)

Water Science & Technology ◽

10.2166/wst.1996.0497 ◽

1996 ◽

Vol 33 (4-5) ◽

pp. 137-144 ◽

Cited By ~ 2

Author(s):

Josef Hejzlar ◽

Vojtech Vyhnálek ◽

Jirí Kopácek ◽

Jirí Duras

Keyword(s):

Czech Republic ◽

Population Density ◽

Atmospheric Deposition ◽

River Basin ◽

Point Sources ◽

Diffuse Sources ◽

River Elbe ◽

Municipal Wastewaters ◽

Total P

Export and sources of P in the Vltava basin (subbasin of upper Elbe: total area – 28,093 km2; population density – 115 km−2; forests – 35%, farmland – 51%) were evaluated during 1972–1993. Annual export rates of total P from the basin to the river Elbe ranged between 38 and 68 kg km−2 a−1. Reservoirs with hydraulic retention times longer than 15 days were efficient traps for phosphorus retaining 20 to 30% of total P loading into the watercourses. Point sources (municipal wastewaters) were most important throughout the period and their share varied from approximately 60% in wet years to more than 90% in dry years. Export from diffuse sources (dominated by output from farmland) was highly dependent on discharge and fluctuaded between 5 and 40 kg km−2 a−1 in dry and wet years, respectively. Only about 2% of the P input into the basin from the fertilisation of farmland and from the atmospheric deposition was exported to the watercourses.

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Multi-Objective Model-Based Assessment of Green-Grey Infrastructures for Urban Flood Mitigation

Hydrology ◽

10.3390/hydrology8030110 ◽

2021 ◽

Vol 8 (3) ◽

pp. 110

Author(s):

Carlos Martínez ◽

Zoran Vojinovic ◽

Arlex Sanchez

Keyword(s):

Green Infrastructure ◽

Overland Flow ◽

Flood Damage ◽

Optimal Number ◽

Rainfall Runoff ◽

Urban Catchment ◽

Model Based ◽

Model Domain ◽

Infiltration Processes ◽

2D Model

This paper presents the performance quantification of different green-grey infrastructures, including rainfall-runoff and infiltration processes, on the overland flow and its connection with a sewer system. The present study suggests three main components to form the structure of the proposed model-based assessment. The first two components provide the optimal number of green infrastructure (GI) practices allocated in an urban catchment and optimal grey infrastructures, such as pipe and storage tank sizing. The third component evaluates selected combined green-grey infrastructures based on rainfall-runoff and infiltration computation in a 2D model domain. This framework was applied in an urban catchment in Dhaka City (Bangladesh) where different green-grey infrastructures were evaluated in relation to flood damage and investment costs. These practices implemented separately have an impact on the reduction of damage and investment costs. However, their combination has been shown to be the best action to follow. Finally, it was proved that including rainfall-runoff and infiltration processes, along with the representation of GI within a 2D model domain, enhances the analysis of the optimal combination of infrastructures, which in turn allows the drainage system to be assessed holistically.

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